ketchum



(No Model.) 2 Sheets-Sheet 1. 0. W. KETGHUM. GAS PRODUCER. No. 490,771.Patented Jan." 31,1893.

H C Z/LF fi L EV/Z/ Z 51131? 3 4L m r (No Model.) ZSheet-Sheet 2.

0. W. KETGHUM. GAS PRODUCER.

No. 490,771. Patented Jan. 31, 1893.

AENT rricis.

OLIVER WILLIAM KETOHUM, OF TORONTO, CANADA.

GAS-PRODUCER.

SPECIFICATION forming part of Letters Patent No. 490,771, dated January31 1893. Application filed March 29,1892. $erial No. 426,944. (Nomodel.)

i To all whom it may concern:

Be it known that I, OLIVER WILLIAM KETCHUM, a subject of the Queen ofGreat Britain, residing at Toronto, in the Province of Ontario andDominion of Canada, have invented certain new and useful Improvements inGas-Producers; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates generally to gas producers where coal is gasifiedand the. gas is burned in aseparate furnace. In these gas producingfurnaces great difficulty has been experienced in keeping the apparatusin good order because of the accumulation of. ashes in the grate whichin some instances necessitates the stopping of the apparatus that it maybe cleane 7 My invention further consists in, and more particularlyrelates to the form of grate used which belongs to that class known asrotary or revolving grates, and is constructed of two circular plates aswill be hereinafterdescr-ibed. In the accompanying drawings Figure 1' isan elevation of the grate showing part of a furnace. Fig. 2 is'a sectionon an enlarged scale. Fig. 3 is a top plan of the grate the top platebeing partly'broken away, and Fig. 4 is a section on the line 2-2 Fig.2.

Referring to the drawings A represents the upper plate which is ofgreater diameter than A the lower plate, and has upon its periphery thegears 19 b. Upon the outer edge of this plate A are pivoted two or morescrapers K. K, which so adjust themselves when the grate revolves as toscrape the circumference of the fire pot and push the loose ashes towardthe center of the plate. Each of these plates has the ordinaryperforations a a common to all grates and besides the perforations eachplate has two large openings 13. B. so arranged that those in the upperplate are not in line with those in the lower plate.

C is a heavy iron pipe which conducts air to the furnace from a blower(not shown).

Fitting over the end of pipe 0 is the casting E. having the chamber 6which is provided with a series of holes 6 e as shown. Formed integralwith the casting E and extending up through a hole in the center of thegrate just under the hollow perforatedcone F, which is secured on plateA, is a .pipe E which conducts air to the upper part of-thefuel throughthe said cone F. This pipe E forms an axis for the grate the weight ofwhich is supported by the pipe 0. Surrounding the pipe E is the'circularcollar G having the upper and lower flanges G, G2 respectively. Thiscollar is rigidly secured to the upperandlower plates A, A by therespective flanges, as clearly shown in Fig. 2.

D, D, are standards supporting the circular plate D and are providedwith rollers D which serve to support the outer edge of plate A- jLocated around the collar G is the stationary'disk H which is providedwith the rollers M, M, designed to contact with said collar and preventfriction. Secured to this disk H'by any suitable means and extendingacross the lower plate A to the plate D are the stationary arms H, H,the use of which will be hereinafter stated.

D D are antifriction balls placed between the disk H and plate A.

The operation ofthe device is as follows:

When air is forced through pipe C the current divides becausethe pipe Eis of less diameter than pipe 0 and is unable to carry off all of theair; some is therefore forced back through the holes 6 e, and risesthrough the perforations a 0t and openings B. B. in the plates, to feedthe fire. The rest of the current passes to the fire through theperforations in the hollow cone F. When it is necessary to remove theashes from the grate, the handle 01 is turned and the worm b on shaft01' meshes with the cogson the upper plate and causes the grate torevolve as indicated in Fig. 3. The compact condition of the burningfuel in the fire pot keeps it from turning with the grate and as thesaid grate revolves the ashes fall through the holes B, B, in the plateA on plate A. The ashes move with the lower plate until they arearrested by coming in contact with the stationary arms H, H, heretheyare retained until they fall through the holes B, B, in plate A intothe IOC ash pit I. In the ashpit I construct a screw 7 L for removingthe ashes which is operated by the crank 0 through the gearing as shownin Fig. 1.

What I claim as new is: 1. In a gas producing furnace a grate composedof an upper and a lower circular plate rigidly connected by a flangedcollar, said upper plate having gear teeth on its periphery and a hollowcone located above its center, and means for rotating said platessubstantially as described.

2. In a gas producer a grate composed of an upper and a lower plate eachprovided with openings B, B, said upper plate having the gear teeth andcarrying two or more pivoted scrapers and the hollow cone; a castingprovided with the chamber E and having a pipe E extending'up through acentral hole in said plates and connected to an air supply pipesubstantially as shown.

r 3. In a gas producer, a grate composed of an upper and a lower platerigidly connected by a flanged collar, said upper plate having the gearteeth and carrying the pivoted scrapers and the hollow cone; the castingE having the chamber e provided with the holes 6 e and the pipe Eextending up through a central hole in said plates, the standards D Dsupporting the plate D which carries the rollers D said plate D beingrigidly connected to a disk H by the arms H, substantially as described.

4. In a gas producer the combination of the upper plate having the gearsand carrying the pivoted scrapers and the cone, the lower plate rigidlysecured to said upper plate by the flanged collar and means for rotatingsaid

